I have just released for the first time my simultaneous audio masking
library.
You can get an idea of what it is/does from here :
http://www.flatmax.org/libaudiomask-dev/API-libaudiomask/
The beauty of this library is its simplicity.
You can use any reasonable sample rate.
You can use any reasonable window size.
If you are interested, then you can get the source code here :
http://packages.debian.org/sid/libaudiomask-dev
This library is under GPL license.
If you want to use it commercially in some 'non-free' way, you MUST
contact me and negotiate a new license.
Matt